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Engine identification

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Engine identification

Post #1 by rratselad » Wed May 30, 2018 5:38 pm

Hi All,

I'm hoping you can help me identify an engine. The casting number (if I'm reading it right) is C9AE-6015-B. Picture here: ... ZIKF19_HFG

For me, this one is a bit interesting as it's in a 1970 Econoline that has been passed down from my grandfather. The build sheet and sales form show the truck shipped with a 240. My grandfather wasn't a performance guy. The whole van is pretty original, including the paint.
I have to believe that he never swapped out the motor for a bigger one.

An odd part of this has come up over the past few days as I've started to do some rebuilding is that Damper Doctor told me my damper decoded as being from a 300. Okay... I've seen posts about them being interchangeable. The second clue that something was off came when I delivered the head to the machine shop today and the owner asked me if I was sure it wasn't a 300. I showed him the original paperwork and we both scratched our heads. He measured the bore size on the head and found it to be 4". At 4", he seemed pretty sure that my motor is a 300 and not a 240.

This site seems to indicate that the 240 and 300 have the same bore size, but the stroke length makes the difference: ... bolts.html

I haven't had much luck decoding the casting number. The first part of the numbers seem to indicate that the casting is from 1969, which matches, but I can't seem to narrow it any further to a 240 or 300. Can anyone help?


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Re: Engine identification

Post #2 by BigBlue94 » Wed May 30, 2018 6:31 pm

Both 240 and 300 do have a 4" bore.

As for the head, a 240 should have an "A" stamped under the thermostat housing mounting surface . There should also be one under the valve cover and rockers. The combustion chamber will be kidney shaped.

A 300 head will have "T"s instead of "A"s, and "D" shaped combustion chambers.

Both heads fit both 240 and 300 as they use the same block.

I pulled a 300 head out of a 74 E100 that had a 240 originally. The van was only on the road 11 years. Just goes to show that anything is possible when dealing with the unknown.

Usually an "A" in the casting code will tell you if it was 240 or 300, but only if it's a part that varies between the two.

C9AE means that specific part design was created or revised in 1969. The AE is not exactly decipherable, nor are the following digits. The casting code will not tell you when the part was actually made, or what it is. For reference only: a C9 marked part could still be used on a new 73 at the factory. There may not have been a D0, D1, D2, or D3 verison of that specific part. For direct reference, a roller ready 351 block has an F4TE casting code. They could be found in late 93-97 351 Windsors. I had one, in a 94 bronco that was marked F4_E: no letter in the third slot.

Others will chime in, who are much more experienced than I.
1985 Bronco. 300-6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. 300 has a 4bbl and headers.

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Re: Engine identification

Post #3 by bubba22349 » Wed May 30, 2018 7:39 pm

Your engine blocks design numbers C9AE-6015-B decode as this

C is the decade and = 1960
9 is the year added together = 1969
A is for the Ford model line the part was design for = a Ford car (the full size)
E is for the Enginering department that designed it = Engine
6015 is the Ford part number that denotes a cylinder block
B is the number of times the part has been redesigned or improved = 2
X2 The head numbers will be semular find them under the thermostat mounting looking at the combustion chamber side. Since the block numbers have the AE code your engine would be a 240. Your engine may still be the orginal engine to know more like the exact date the block was cast at the Ford foundry look for the casting date code it's 3 or 4 numbers plus a letter looks like a small metal tag with a screw head on each end in the casting. Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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Re: Engine identification

Post #4 by rratselad » Sun Jun 03, 2018 9:23 am

Thank you!

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Re: Engine identification

Post #5 by Fordman75 » Sun Jun 03, 2018 5:57 pm

You can't go off just the block #'s alone. I've seen a few 300's that had 240 blocks. So you have to compile all the info together from everything to confirm it's a 240 or 300.

To know 100% for sure what engine you have you'll have to measure the stroke.

3.18" = 240
3.98" = 300.

Or drop the oil pan and check the casting #'s on the crankshaft itself.

If the crank has the following you can determine which engine it is:

1L or 1LA = 240

1N or 1NA or 1NAB or 1NABC or 2NABC = cast 300 crank.

C5TE-F or C6TE-G = steel 300 HD crank. I've also seen these have "$" on them. Which is quite fitting! :lol:

54 Ford F100/F150 4x4
300, NP435 4spd, NP205 transfercase

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Re: Engine identification

Post #6 by Josh Jones » Sun Jun 03, 2018 9:22 pm

You could always pull a spark plug and use a wire to measure the stroke as you turn the engine over with a wrench.
You will have to read the casting number on the head to know what it is. Block casting numbers won’t be reliable.
1984, Ford, F150, 4x4, Rc, SB, 4.9 L6 Engine, Np435 Transmission, Np208F Transfer Case, "Little Red"
1994, Ford, F150, 4x4, RC, SB, 521cu BBF Engine, C6 transmission, Cyclone 10" Billet Quick Change Gear Box. "Honey Bunny"

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